Brake shoe assembly

Abstract

A brake shoe assembly including a brake lining member and a backing plate or shoe have aligned rivet opening pairs for riveting together with the use of dead soft metal rivets having tapered shank portions the volumes of which are substantially equal to the combined volume of the openings through which they extend for riveting, the rivets also having tubular, cylindrical end or tip portions adapted to roll over the outside of the backing plate or shoe while the shank portions substantially completely fill their openings during setting of the rivets to provide for exceptional strength, both in shear and tension, of the assemblage.

What I claim as new and desire to secure by Letters Patent is: 
     
       1. A brake shoe assembly comprising, in combination, a brake lining member, a metal brake shoe member in face-to-face relative engagement with respect to said brake lining member, a plurality of pairs of substantially aligned openings in said brake lining member and said brake shoe member for the reception of rivets for riveting said brake lining member to said brake shoe member, said rivets being of substantially dead soft metal before rivet setting and each comprising a rivet head portion integrally formed with a convergently tapering frusto-conical shank portion, said frusto-conical shank portion terminating in a cylindrical tubular tip portion, said tubular tip portion being defined by an axial recess the inner end of which extends somewhat beyond the plane of juncture of said tip portion and said frusto-conical shank portion, the maximum diameter of said frusto-conical shank portion, before rivet setting, being less than the diameter of said pair of aligned rivet openings and the volume of said frusto-conical shank portion being substantially equal to the combined volumes defined by said pair of aligned rivet openings whereby, upon setting said rivet in place, said frusto-conical shank portion will expand laterally to substantially completely fill the associated pair of aligned rivet openings and said tip portion will be rolled over in clamping engagement about the outside of the brake shoe member rivet opening. 
     
     
       2. A brake shoe assembly as defined in claim 1 wherein the openings in said brake shoe member are back-tapered to be of increasing diameter from the inside to the outsides thereof. 
     
     
       3. A brake shoe assembly as defined in claim 1 wherein said brake lining member and said brake shoe member are flat for use in disc brake assemblies. 
     
     
       4. A brake shoe assembly as defined in claim 3 wherein said rivets are of soft steel. 
     
     
       5. A brake shoe assembly as defined in claim 1 wherein said rivets are of soft steel.